Worn with No 1 dress uniform for ceremonial / formal occasions. A really nice touch for any one getting married in uniform, looks very smart and make it look like your wearing a shirt under your tunic. Dress regulations state that you must wear a white shirt with a grandad collar and gold cufflinks whilst in No1 Undress uniform, commonly known as blues. The collar is then fitted. The collar should not meet at the front it should be approx 1 inch apart.